330 



WEED FLORA OP IOWA 



Figure 190A • Figure 190B 



Fig. 190-A. Plant hairs or trlchomes of ragweed. 



(Drawing by Charlotte M. King.) 



Fig. 190-B. Distribution of Small Ragweed. 



up the land with a preferred food for stock and at the same time 

 restoring the nitrogen content to the soil, enabling the blue grass 

 to make more rapid growth. 



Fig. 191. A weedy Iowa field ; Ragweed, Foxtail, Barnyard Grass, etc. The 



seeds are sown in the field for ne:tt year. 



(Photographed by Pammel.) 



